Study on Decomposition of Multialkylated Cyclopentane Oil with Sulfur-Containing Additive on the Nascent Steel Surface

Lü, Renguo; Mori, Shigeyuki; Nanao, Hidetaka; Kobayashi, Kimihiro; Minami, Ichiro

doi:10.2474/trol.2.105

Cited by 7 publications

(9 citation statements)

References 11 publications

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“…Vacuum tribometer tests conducted using vacuum‐stable lubricants give the opportunity to investigate lubricant degradation in situ by linking the tribometer to a chemical analyser such as a mass spectrometer. Consequently, gaseous reaction products like hydrogen and low molecular fragments can be detected and correlated to lubricant decomposition . These reactions leading to the release of such low molecular compounds are usually catalysed by the oxide‐free steel surface formed in tribological contact .…”

Section: Introductionmentioning

confidence: 99%

Tribochemical degradation of vacuum‐stable lubricants: A comparative study between multialkylated cyclopentane and perfluoropolyether in a vacuum ball‐on‐disc and full‐bearing tests

Kürten

Khader

Kailer

2020

Lubrication Science

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In this study, the decomposition of a multialkylated cyclopentane (MAC) and a perfluoro-poly-ether (PFPE) lubricant was investigated in a ball-on-disc sliding test under vacuum and in a rolling contact fatigue (RCF) test on full bearings. In situ mass spectrometry was conducted to study the tribochemical formation of hydrogen in a steel-on-steel ball-on-disc sliding contact. Further investigations on lubricant degradation in rolling-sliding contact indicated fragmentation and oxidation reaction of the MAC oil by interaction with the oxide layer and the nascent bearing steel. Finite element method (FEM) analysis was carried out to model the contact in the ball-on-disc experiments and to extract contact surface temperature fields. Post-RCF hydrogen analysis of bearing components indicated increased hydrogen content in the samples lubricated with the MAC fluid. The RCF tests with PFPE did not indicate any signs of surface damage. K E Y W O R D Sball-on-disc sliding test, cylindrical roller thrust bearings, hydrogen, lubricant degradation, lubrication, rolling contact fatigue, vacuum tribology

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Section: Introductionmentioning

confidence: 99%

Tribochemical degradation of vacuum‐stable lubricants: A comparative study between multialkylated cyclopentane and perfluoropolyether in a vacuum ball‐on‐disc and full‐bearing tests

Kürten

Khader

Kailer

2020

Lubrication Science

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“…In addition, these additives can as well reduce the degradation of the lubricant under tribological contact. 22,29,30…”

Section: Introductionmentioning

confidence: 99%

“…In addition, these additives can as well reduce the degradation of the lubricant under tribological contact. 22,29,30 Since it is not clearly understood which parameters influence the hydrogen permeation, and the cause of white etching areas (WEA), the tribologically induced hydrogen permeation is examined in detail in this study. Therefore, a special cell was developed and manufactured to measure the hydrogen permeation as a function of tribological parameters.…”

Section: Introductionmentioning

confidence: 99%

In-situ-determination of tribologically induced hydrogen permeation using electrochemical methods

Oberle

Amann

Kürten

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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White etching cracks are one of the possible causes of bearing damage, which can lead to the failure of wind turbines. The mechanisms of hydrogen diffusion in bearings are not yet fully understood, but it is assumed under tribological loading that the lubricant degradation releases hydrogen which diffuses into the contacting surfaces (i.e. steel). This leads to hydrogen-induced cracking and damage to the bearings. In order to better understand these mechanisms, it is necessary to investigate the influence of tribological loads and lubricant composition on hydrogen release. For this purpose, a test setup was developed for the analysis of tribologically induced hydrogen permeation by means of a ball-on-plate test. The diffused hydrogen was measured with an electrochemical three-electrode setup. The results showed a direct correlation between the amount of hydrogen released and the applied normal load. Furthermore, an increased velocity resulted in enhanced diffusion of hydrogen through metal. In addition, the tribological contact surface was decisive for hydrogen permeation. The higher velocity and the larger contact area result in an activated nascent iron surface which promotes hydrogen penetration. The results show that lubricants can be classified as critical for the formation of hydrogen embrittlement in tribological contacts.

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“…In addition, saturated hydrocarbons like n-hexane can hardly adsorb on nascent steel surfaces at room temperature, because they do not have functional groups which interact chemically with the surfaces. However, it has been found that synthetic hydrocarbon oil of MAC (Multi Alkylated Cyclopentane) tribochemically decomposed readily on nascent steel surfaces at mechanical contact resulting in formation of hydrogen and methane [11][12][13][14][15]. This result can be explained by the activity of nascent steel surfaces as well as high temperature caused by mechanical contacts.…”

Section: Introductionmentioning

confidence: 99%

Tribochemical Reaction of Benzene on Nascent Steel Surface and Effect of Temperature

Shimotomai¹,

Nanao

Mori

2012

Tribology Online

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The effect of temperature on the adsorption of benzene on the nascent surface of steel was examined. Cutting tests were carried out under high vacuum condition. The components adsorbed onto or desorbed from the nascent surfaces formed by cutting were monitored by a quadrupole mass spectrometer. The adsorption rate of benzene decreased with increasing temperature whereas desorption rate of hydrogen and adsorption rate of water increased. It appeared that water from residual gas preferentially adsorbed onto the nascent surface to disturb benzene adsorption as the temperature increased where the water was decomposed to form hydrogen. In this study, it was found that the reaction of adsorption on mechanically formed nascent surfaces is affected by temperature. Adsorption activity of mechanically formed nascent surfaces was calculated.

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Study on Decomposition of Multialkylated Cyclopentane Oil with Sulfur-Containing Additive on the Nascent Steel Surface

Cited by 7 publications

References 11 publications

Tribochemical degradation of vacuum‐stable lubricants: A comparative study between multialkylated cyclopentane and perfluoropolyether in a vacuum ball‐on‐disc and full‐bearing tests

Tribochemical degradation of vacuum‐stable lubricants: A comparative study between multialkylated cyclopentane and perfluoropolyether in a vacuum ball‐on‐disc and full‐bearing tests

In-situ-determination of tribologically induced hydrogen permeation using electrochemical methods

Tribochemical Reaction of Benzene on Nascent Steel Surface and Effect of Temperature

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